Ruppert, Karl, Udo E. Simonis, and Thiemo W. Eser. “Rezensionen”. Raumforschung und Raumordnung | Spatial Research and Planning 58, no. 1 (January 31, 2000): 70–74. Accessed August 15, 2026. https://rur.oekom.de/index.php/rur/article/view/1135.